Looks like the file is too large to attach here. Please pm me your email address and I will send it to you.
Basically, the joystick shaft fits through the middle of the piece. It's is rather snug so I would say that measurement is critical. The larger diameter piece at the bottom (from side view) sits against the joystick housing. Then the spring fits over the smaller diameter piece at the top (from side view). There is another retainer that then compresses the spring. The retainer is held in place by a clip.
I really appreciate you helping me out with this. If you pm me your address, once I receive the piece from you I will send you out some goodies.